Paul,

Both patches work as designed on Linux and AIX for me. I have reports that our z/OS build has hit the same issue. That one will take some time for the fix to percolate through the build system to validate it; I don't have easy individual access to z/OS.

---
Tim McBrayer



From:        "Paul Eggert" <eggert@cs.ucla.edu>
To:        "Guy Harris" <gharris@sonic.net>, "Tim McBrayer" <TMcBrayer@ABINITIO.com>
Cc:        "Time zone mailing list" <tz@iana.org>
Date:        11/04/2022 09:25 PM
Subject:        Re: [tz] Bug in 2022f version of zic.c

---

On 2022-11-04 16:11, Guy Harris via tz wrote:

> In what cases in zic is emalloc() - or erealloc() - called with 0 as the size argument?

It's when zic sees a Zone with no continuation lines. I didn't notice
the bug in testing, since I don't test with AIX. The portability bug was
triggered by the removal of the Qt bug workaround in tzcode 2022f, which
when combined with the -bslim option introduced in tzcode 2019b means
that zic can generate TZif files with no time transitions.

Thanks for reporting the bug, Tim. I installed the first attached patch;
please give it a try. I think this fixes the only place that might call
malloc(0) or realloc(p, 0).

It's unfortunate that the C standard allows malloc to return NULL on
success, as this complicates error checking. Of course zic.c should be
portable even to platforms that exploit this glitch in C.


> (ecpyalloc() - which should probably be called estrdup() to make it clearer that it's "strdup() with quit on out-of-memory"

Good suggestion, thanks. I installed the attached second patch to do that.
[attachment "0001-Port-to-AIX-6.1-malloc.patch" deleted by Tim McBrayer/AbInitio] [attachment "0002-Rename-ecpyalloc-to-estrdup.patch" deleted by Tim McBrayer/AbInitio]


 
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